180 
DE. A. MATTHIESSEN OX THE SPECIEIC GEAYITT OF AELOTS. 
The specific gravity of an aUoy is calculated from the above formulae, under the sup- 
position that the specific gravity of the metals employed take part of that of the aUoy 
in the ratio of their relative volumes (1.), equivalents (2.), or vreights (3.). Of these 
formulae only the first is for all cases correct, supposing the alloy neither contracts 
nor expands ; the second only when the volumes and equivalents of the metals employed 
are in the same ratio with each other, as in the case of gold, silver, &c. ; and the third 
only when the specific gravities of the two metals are equal. The two last methods of 
calculation are here mentioned, as several chemists have calculated their results fi-om 
these formulse. 
Table II. 
Antimony-Tin Series (determined by Mr. C. Long). 
Alloy. 
Mean of 
Calculated specific 
gravity, from 
volume. 
Ratio of volumes. 
v+L* 
V 
Specific gravity 
fotmd. 
T. 
SbgSn 
6-739 
16-2 
6-752 
1-0019 
Sb^ Sn 
6-747 
13-4 
6-770 
1-0034 
Sbg Sn 
6-781 
13-5 
6-817 
1-0053 
Sb Sn 
6-844 
13-8 
6-889 
1-0066 
SbSng 
6-929 
15-8 
6-984 
1-0079 
SbSn^ 
7-023 
15-8 
7-082 
1-0084 
SbSng 
7-100 
10-6 
7-133 
1-0046 
SbSnjg-t- 
7-140 
19-0 
7-186 
1-0065 
SbSnjg 
7-208 
18-5 
7-234 
1-0036 
SbSn^o 
7-276 
19-4 
7-262 
0-9981 
Sb Snjgg 
7-279 
20-0 
7-281 
1-0003 
Sb Sn^gg 
7-284 
20-2 
7-287 
1-0004 
Antimony-Bismuth Series (determined by Dr. M. Holzmaxx). 
Sb2 Bi 
7-864- 
9-4 
7-856 
0-9989 
Sb Bi 
8-392 
11-0 
8-385 
0-9991 
Sb Bio 
8-886 
14-0 
8-888 
1-0002 
Sb Bi^ 
9-277 
12-1 
9-272 
0-9995 
Sb Big 
9-435 
9-4 
9-433 
0-9998 
Antimony-Lead Series (determined by A. Matthiessex). 
Sb Pb 
8-201 
13-7 
8-268 
1-0082 
Sb Pb2 
8-989 
11-7 
9-945 
1-0062 
SbPb^ 
9-811 
14-3 
9-822 
1-0011 
SbPbg 
10-144 
15-4 
10-211 
1-0066 
Sb Pbjo 
10-586 
19-3 
10-599 
1-0012 
ShPb2g+ 
10-930 
19-9 
10-952 
1-0020 
Sb Pb,o 
11-194 
20-5 
11-196 
1-0002 
* Where v=- volume of the alloy found, aud V-|- V,= volumes of the metals composing it. 
